The 273 is absolutely worth rebuilding. Personally love to keep classics with their original engine size. They already have a forged crank and with a little head porting or porting in combination with valve size increase and notching cylinders, tailoring cam specs depending on gears and headers plus a good intake manifold matched to heads they are most impressive even a modded non commando lower compression 2bbl setup. Also they love cfms once modded just like all mopar small blocks. Will never be torque monsters so gearing is critical.
Here is video of nasty 273 in my 65 Dart rt. after build began. Had about $3700 in engine build.
